These are Berol Fine pens, sold as a six-pack. Similar in thickness and weight to an ultra-fine permanent marker, but the ink does not bleed through the paper.
Hardwearing round-ended thick black felt tip, .6mm in line width.
Please note: These pens may not be suitable in certain situations where limited space is available, e.g. signing checks
Pen marks will wash out. If pen should leak on clothing, cover the stain in washing up liquid and leave it to soak in. With the washing up liquid still on the stain, wash clothing in the normal manner.